High-speed reciprocating saw



Sept. 24, 1929.

c. s, BATES 1,729,324

HIGH SPEED RECIIROCATING SAW Filed Sept. 16. 1927 2 Sheets-Sheet 2 'l 75 A r E yrszfiicixre [ar/ 5. Ba?

Patented Sept. 24, 1929 UNITED STATES PATENT OFFICE CARL S. BATES, OFCHICAGO, ILLINOIS, ASSIGNOR T INTERNATEONAL STAMPING 00., OF CHICAGO,ILLINOIS, A CORPORATION OF ILLINOIS HIGH-SPEED REGIPROCA'IING SAWApplication filed September 16, 1927. Serial No. 219,840.

My invention relates particularly to scroll or jig saws, but I'haveextended the field of such saws, particularly in the small and lightsizes, by employing a saw blade of high cutting speed. I

By employing a short reciprocating saw blade of high speed directlyconnected to motor, I can readily cut a comparatively thick plank or thelike without the necessity of supporting the saw blade at both of itsends, and without the necessity of bracing on or in the saw tableanything to guide the saw blade. The table is therefore inex Jensive; itmay be readily tilted; and because it has an unobstructed workingsurface, one may use the saw for mortising, routing, etc.

It is an object of my invention to provide a light motor-operated sawemploying a high speed reciprocating blade supported at one end yetcapable of quickly and etliciently cutting not only small but relativelylarge stock.

It is also an object of my invention to provide a light motor-operatedhigh speed reciprocating saw having a saw table entirely free of sawguiding means so that it may be readily tilted and so that the saw maybe readily applied to such purposes as routing and mortising as well asthe other and more obvious applications of a saw of this type.

On the drawings:

Figure 1 is a side view in elevation of a device embodying featuresofthe present invention, shown equipped with a motor.

Figure 2 is a rear elevational view of the device with parts in section.

Figure 3 is a front view in elevation of the device.

Figure 4 is a fragmentary side elevational view with parts in section.

Figure 5 is a fragmentary plan view with the table removed to show thesaw guide.

Figure 6 is a fragmentary plan view with the table removed and parts insection to show the saw guiding means and the blade fastening means.

Figure 7 is a plan view of the table and material guiding means.

Figure 8 is a view similar to Figure 7 showing a different adjustment ofthe guiding means.

As shown on the drawings:

Numeral 10 indicates a motor alignably supported on a base or platform11 by bolts entered in slots, not shown, in the platform, or by anyother suitable means.

The numeral 12 indicates a pedestal having a shallow box portion 13 anddepending and outturned arms 14 preferably integral therewith, the arms,in this instance, being slotted at 15 so that theymay be adjustablysecured by bolts 16 to slotted lugs 17 on one end of the platform 11whereby the pedestal may be vertically adjusted to suit various sizes ofmotors. I

An upwardly extending arm 18 integral with the box portion of thepedestal 12 supports a saw table 19 which is removably secured theretoby a screw or bolt 20 and so that the table may be tilted to any desiredangle as indicated by the dotted lines in Figure 3.

Apertured bosses 21 are formed on the upper and lower sides of thebox-like por tion 13 and a reciprocatory tube or shaft 22 is slidablypositioned therein. Obviously suitable bearing means may be inserted inthe apertured bosses if so desired.

A cap 23 is secured to the upper end of the tube 22 by a screw 2 1 sothat it moves with the tube.

The cap 23 is adapted to securelyhold one end of a saw blade 25,theother end of which extends tl'irough a suitable opening in the table19 and is preferably unsupported. The blade 25 is guided by a guide 26positioned on the arm 18, and below the table 19, so that the table isfree of obstructions.

The blade 25 is reciprocated at a high speed by means to be discussedlater, and because of its high speed, it becomes rigid enough to enableit to saw through relatively thick material and to be used for routing,mortising and similar operations usually confined to machines havingsaws guidingly supported at both ends.

It will be observed that the pedestal construction affords a supportingmeans with a relatively wide base and with vertical members braced andstiffened by the lateral sides and the back of the box. Although thedevice is preferably relatively light and portable, the pedestal hasthat stiffness and free dom from joints so necessary in the directdriven saw operated at high speeds where the slightest misalignment orplay would give rise to destructive vibration and hammering.

It will also be observed that the pedestal, in effect, is a continuationof motor platform 11, yet arranged so that motors of varying heights andbase length may be "employed in the operative unit.

A guide rod 27 extends through the upper and lower sides of the box 13and a bifurcated arm 28 formed integral with the cap 23 is in slidingengagement with the rod to prevent turning of the tube or shaft 22.

For operatively connecting the saw to the motor means are provided whichcomprise, in this instance an arm or pin 29 formed integral with the cap23 which acts as a pivot shaft and is connected by means of a connectingrod 30 to a balanced crank 31 on a shaft 32 of the motor 10. v

The device is adapted to be driven by any suitable motor of any desiredspeed, the saw making one downward cutting stroke with each revolutionof the motor. Lubricant passages 36" are provided in the pedestal 12 andprovide means for adequately lubricating the reciprocatory tube 22within the bosses 21. The passages may be filled with a suitable wickingor packingif so desired.

It is very important to note here that the saw blade 23 has the teethfiled away, and its end reduced backward as indicated at 38, so that thefree end of the blade is tilted forward slightly and the downward travelof the blade in the holder is limited by the abutment formed at theupper end of the tapered portion, as shown in Figure at. This has theeffect of. freeing the, saw on the upper stroke and is very effective inpreventing chattering or lifting of the worked ma terial and so enablesthe use of a high speed saw on relatively thick material and with anease of manipulation not heretofore possible. The blade is held in aU-shaped member 39 and secured in the cap 23 by the. screw 24%.

To aid; in easily operating the present invention material guiding meansare provided. Formed along one or more edges of the saw table 19 is adepending lip or flange 33 to which a slider 34 is removably andadjustably secured by a clamping element Adjust ably secured to theslider 3 by suitable means, in this instance, a bolt 36, is a guide 37slotted as at 38 to permit suitable adjustments thereof relative to theslider. As shown the guide 37 is provided with a flat face to restuponthe table 19 and an upright face to contact and guide the material to besawed. Figure 7 illustrates one adjustment of the guiding.

means for cross-cutting, andFigure 8, an adj ustment of the guide meansfor ripping. Obviously the guide means may be adjusted to properlyhandle material of various sizes, both large and small.

From the foregoing it is apparent that I have provided a device of theclass described herein which is adjustable to fit various sizes ofmotors, which has an adjustable table thereon, which aids in cuttingmaterial. in various ways, which is provided with adjustable guidingmeans for the cutting of the aforesaid material, which is made of fewand simple parts readily accessible, and which may be economicallymanufactured.

I am aware that many changes may be made, and numerous details ofconstruction may be varied through a wide range without departing fromthe principles of this invention, and I therefore do not purposelimiting the patent granted thereon, otherwise than necessitated by theprior art.

I claim as my invention:

1. The combination with a motor platform having an upstanding support, atable having a pedestal adjustably secured to the said support, saidpedestal having spaced bearings therein, a tube slidable in saidbearings, a saw blade carried by said tube and extending above the saidtable, and a motor on the said plat-form having a driving connectionwith the said tube.

2. In combination with a. motor platform having upturned slotted lugs atone end, a pedestal having a shallow box portion and depending andoutturned arms adj nstably secured to the said lugs and having anoutturned and upturned arm adapted to adjustably support a tablethereon, the said box portion of the pedestal having spaced bearingstherein, a tube slidable in the said bearings, a saw blade carried bythe said tube and a motor on said platform having a driving connectionwith the said tube.

3. In a device of the class described, a base, a motor on the base, apedestal mounted on said base, said pedestal having a bearing thereon, atube reciprocable in said bearing, driving means connecting said motorwith said tube, a rodon said pedestal, and a member mounted on said tubehaving means for retaining a cutting element therein and having anextending arm slidably engaging said rod.

In testimony whereof I have hereunto subscribed my name at Chicago, CookCounty, Illinois.

CARL S. BATES.

